#animasi_preloader 
 {
    position: absolute;
    inset: 0;
    backdrop-filter: blur(2px);
    z-index: 99999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: opacity .5s ease;
}
.spinner_preloader {
    width: 50px;
    height: 50px;
    border: 4px solid #ddd;
    border-top: 4px solid #0d6efd;
    border-radius: 50%;
    animation: spinner_form 1s linear infinite;
}

@keyframes spinner_form {
    to {
        transform: rotate(360deg);
    }
}